Publication date: 17th July 2025
Zero-dimensional perovskites have received intensive attention due to their low formation energy and soft ionic nature. Although thermochromism has been observed in perovskite materials, little is known about the effects of A-site cations and exciton-phonon coupling on the color-switching mechanism and most work looks at single-phase perovskites, such as 2D or 3D structures. But no one has studied dual-phase ones yet .Here, thermochromism in a composite perovskite where CsPbBr3 nanocrystals are embedded in a matrix of Cs4PbBr6 microcrystals has been reported. Reversible color switching occurs with a progressive change from yellow-green to orange in a wide temperature range of 295 - 495 K. It is found that the temperature-induced bandgap change can be attributed to the competing interaction between lattice thermal expansion and electron-phonon interaction. The entire heating and cooling process is accompanied by the movement of Cs+ and distortion of the [PbBr6]4- octahedron, while the former is more drastic through the temperature-dependent Raman spectra and verified by Materials Studio calculations.
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